Definition: A "nightly" is a bleeding edge release that is built on a daily basis, usually at night after a full day's worth of new code has been committed.

It could oftentimes be unstable and not properly tested, lacking any changelogs, but eventually evolving into alphas, betas, release candidates, and finally stable releases.

Update: Confirmed working on both Sensation and T-Mobile Sensation 4G.

Have an HTC Sensation or T-Mobile Sensation 4G? Your day may have just gotten a little better - CyanogenMod 9 (Android 4.0) nightlies have officially arrived. While we're not 100% sure this ROM actually will work on the T-Mobile version of the Sensation, this thread suggests it's likely possible. That doesn't mean it's particularly easy, though - so be sure you know what you're doing before you go flashing away.

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Hit up CyanogenMod downloads now to get the ROM.

CyanogenMod Downloads